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Interactions between selenium and methylmercury in rat brain
Chemico-Biological Interactions
|February 1, 1977
Summary
Selenium interactions with methylmercury in animal brains show that methylmercury exposure shifts selenium from the cytosol to mitochondria. Selenium did not alter methylmercury distribution in the brain.
Area of Science:
- Neurotoxicology
- Environmental Health
- Biochemistry
Background:
- Methylmercury (CH3Hg+) is a potent neurotoxin.
- Selenium (Se) is known to interact with heavy metals.
- Understanding these interactions is crucial for assessing toxicity.
Purpose of the Study:
- To investigate the interaction between selenium and methylmercury in animal brain tissue.
- To determine how methylmercury affects selenium distribution within brain cells.
- To examine the impact of selenium on methylmercury uptake and distribution.
Main Methods:
- Animals were labeled with radioactive isotopes of selenium (75Se) and methylmercury (203Hg).
- Brain tissues were fractionated into subcellular components.
- Cytosolic fractions were further analyzed using Sephadex G-150 and G-200 chromatography.
- Glutathione peroxidase activity was measured.
Main Results:
- Methylmercury exposure caused a shift of selenium from the cytosol to the mitochondrial fraction in the brain.
- Concurrent selenite injections increased mercury uptake but did not change mercury distribution.
- 203Hg in the cytosol correlated more with protein than with 75Se.
- A slight reduction in glutathione peroxidase activity was observed in methylmercury-treated rats.
Conclusions:
- Methylmercury exposure alters selenium subcellular distribution in the brain.
- Selenium administration does not significantly alter methylmercury brain distribution.
- The interaction suggests a complex biochemical interplay influencing neurotoxicity.
